Cooling device for electric discharge tubes



Dec. 5, 1950 H. RlN lA 2,532,858

COOLING DEVICE FORELECTRIC DISCHARGE TUBES Filed May 7, 1948 INVENTOR.HERRE RZNIA AGFN T.

Patented Dec. 5, 1950 COOLING DEVICE FOR ELECTRIC DISCHARGE TUBES Her-reRinia, Eindhoven, Netherlands, assignor to Hartford National Bank andTrust Company, Hartford, Conn, as trustee Application May 7, 1948,Serial No. 25,705 In the Netherlands June 18, 1947 5 Claims.

This invention relates to a cooling device for an electric dischargetube comprising a cylindrical cooled wall which is provided with anumber of cooling vanesextending substantially at right angles to thiswall and parallel to the generatrices of this wall, the cooling mediumbeing supplied and/or carried off respectively through at least onechannel which extends transversely to the direction of length of thecooling vanes. The invention furthermore relates to an electricdischarge tube adapted to be cooled in such a device.

If the length of the cooling vanes in a cooling device of the characterindicated above exceeds a given value, it is very difficult to solder orto weld a large number of closely adjacent cooling vanes to the cooledwall in such manner that an intimate thermal contact is ensuredthroughout their length. Both the cooled wall consisting of a materialhaving a high thermal conductivity and the cooling vanes of thin sheetmetal usually exhibit unevennesses, owing to which the cooling vanes donot d rectly engage the wall throughout their length. This is truewhether the vanes are each secured individually to the cooled wall orare united in some Way to form a zigzag band.

It has therefore, proved advantageous to make the cooling vanes not toolong, thus providing a number of rings of cooling vanes side by side onthe cyclindrical cooled wall.

However, a new difiiculty arises with an arrangement as described. Thecooling vanes of the various rings will, in general, not be in line witheach other, so that a stream of cooling medium passing in a longitudinaldirection of the vanes from one ring of cooling vanes to the otherexperiences a high resistance. The invention overcomes the latterdisadvantage and yields definite advantages.

In a cooling device for an electric discharge tube comprising acylindrical cooled wall provided with a number of cooling vanes whichextend substantially at right angles to this wall and parallel to thegeneratrices thereof the cooling medium is supplied and/or carried ofirespectively through at least one channel extendtending transversely tothe direction of length of the cooling vanes which, according to theinvention, are arranged in a number of rings arranged side by side, withthe vanes in end-wise relationship, the separation between two ringsbeing in each case centrally located in front of a channel which mayserve either as a supply or as a discharge channel. The separationbetween the rings of vanes then constitutes, in addition, the partitionbetween the opposite streams of cooling medium associated with thesupply or discharge channel, respectively, in situ.

If the cooling vanes are of a comparatively large size radial, it isdesirable that the stream of cooling medium should penetrate throughoutthe length to the bottom of the spaces between the cooling vanes. Thiscan be achieved by leaving some clearance between the rings of coolingvanes, so that a channel, into which the clearances between the vanesopen, is formed all over the periphery of the cylindrical coo-led wall.If, however, the cooling vanes are only of a small radial size, it isadvisable to provide partition walls between the rings of cooling vanes,for example by providing, between the adjacent rings of vanes a flatring which fits around the cylindrical cooled wall.

It will, in general, be suflicient to press the rings of cooling vanesagainst each other in 1011- gitudinal direction. Since the cooling vanesof the various rings are not in line with each other, a partition wallfor the flow of cooling medium between the adjacent rings is thusformed, as indicated above. Furthermore, the fact that the cooling vanesof the various rings are not in alignment results in that in these areassolder will more readily adhere than between the vanes themselves. Ingeneral, however, this is not objectionable, since the partition betweenthe rings of vanes serves as a separation between the currents of air.Consequently, there is no objection to clamping the cooling vanes,whether united to form a zigzag band or not, about the cooled wall andto plunging the assembly into a solder bath, so that the time consumingsoldering of the vanes or rings of vanes each individually is disposedof.

The rings of vanes are preferably formed into zigzag bands in the mannerindicated in U. S. patent specification No. 616,421, now abandoned,according to which the clearance between the parts of a zigzag band isremoved by pressure on the side of the cooled wall.

The above-described system of arranging the cooling vanes in a number ofrings has the advantage that cooling vanes of identical length can beused for cooled walls of different length, viz., by modifying the numberof rings. This results in a reduction of manufacturing expenses, sinceit is not necessary to provide rings with different-s ze vanes forcooled discharge tubes of different size.

In order that the invention may be more clearly understood and readilycarried into effect, it will now be described more fully with referenceto the accompanying drawing, in which Fig. 1 is a side-view of a coolingdevice comprising an electric discharge tube according to the inventionwith the wall partly broken away, and Fig. 2 is a cross-section of thesame device on the line II-II in Fig. 1.

In the drawing, the reference numeral I designates the glass wall of theelectric discharge tube, which is otherwise not essential. The referencenumeral 2 designates the circular-cylindrical metal anode to which ringsof cooling vanes 3 are secured. Around the cooling vanes is provided anumber of annular channels 4 which communicate at one side with a commonsupply pipe 5. The wall of three of the annular channels 4 is partlybroken away to show the relative position of the rings of vanes. numeral5 designates the annular channel formed between two spaced rings ofvanes, '1 designating a fiat ring arranged between two rings of vanesand 8 denoting the drops of solder left between two rings of vanespressed together. The

exhaust cooling-air flows between the channels 4 freely into the openair. The same arrangement could be used for cooling the wall 2, if pipe5 were connected to a suction device and thus used as a discharge pipe,while fresh air is sucked in between the channels 4.

What I claim is:

1. A cooling device for an electron discharge tube of the type having acylindrical wall to be cooled, cooling vanes extending substantially atright angles to said wall and parallel to the generatrices thereof, saiddevice comprising a plurality of channels for the exchange of coolingmedium, said channels extending transversely to the direction of saidcooling van-es, and a plurality of adjacent rings of said cooling vanes,with separations between said rings of vanes, each of said separationsbeing centrally dispcsed in front of one of said exchange channels.

2. An electron discharge tube having an external wall to be cooled andincluding a cooling device of the type having cooling vanes extendingsubstantially at right angles to said wall and parallel to thegeneratrices thereof, said device comprising a plurality of channels forthe exchange of cooling medium, said channels extending transversely tothe direction of said cooling vanes, and a plurality of rings of saidcooling vanes, said rings of vanes being arranged side by side, withslight separations, over a substantial length of the tube wall with saidvanes in endwise relationship, each of said separations being centrallydisposed in front of one of said exchange channels.

The reference 3. An electron discharge tube including a cooling devicehaving cooling vanes of the type as claimed in claim 2, said devicecomprising a plurality of rings of said cooling vanes, said rings ofvanes being arranged side by side in slightly spaced relationship over asubstantial length of the tube wall with said vanes in endwiserelationship, a plurality of channels extending transversely to thedirection of the cooling vanes, said rings of vanes having their spacedends centrally arranged with respect to said channels, and a commonsupply pipe for conveying cooling medium to said channels.

4. An electron discharge tube including a cooling device having coolingvanes of the type as claimed in claim 2, said device comprising aplurality of rings of said cooling vanes, said rings of vanes beingarranged side by side in slightly spaced relationship over a substantiallength of the tube wall with said vanes in endwise relationship, aplurality of channels extending transversely to the direction of thecooling vanes, said rings of vanes having their spaced ends centrallyarranged with respect to said channels, and a common pipe for thedischarge of cooling medium from said channels.

5. An electron discharge tube including a cooling device having coolingvanes of the type as claimed in claim 2, said device comprising aplurality of rings of said cooling vanes, said rings of vanes beingarranged side by side in slightly spaced relationship over a substantiallength of the tube wall with said vanes in endwise relationship, aplurality of channels extending transversely to the direction of thecooling vanes, said rings of vanes having their spaced ends centrallyarranged with respect to said channels, and a common pipe for saidchannels, said pipe being capable of serving as a supply pipe forcooling medium when connected to a source of supply thereof, and capableof serving as a discharge pipe when connected to a suction device.

HERRE RINIA.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,045,659 Lindenblad June 30,1936 2,324,034 Skene July 13, 1943 2,406,121 Young Aug. 20, 19462,468,088 Lewthwaite et al. Apr. 26, 1949 2,476,647 Weschler et al July19, 1949 FOREIGN PATENTS Number Country Date 514,651 Great Britain Nov,14, 1939

